package com.liang.service;

import com.alibaba.fastjson.JSON;
import com.liang.pojo.Content;
import com.liang.utils.HtmlParesUtil;
import org.elasticsearch.action.bulk.BulkRequest;
import org.elasticsearch.action.bulk.BulkResponse;
import org.elasticsearch.action.index.IndexRequest;
import org.elasticsearch.action.search.SearchRequest;
import org.elasticsearch.action.search.SearchResponse;
import org.elasticsearch.client.RequestOptions;
import org.elasticsearch.client.RestHighLevelClient;
import org.elasticsearch.common.text.Text;
import org.elasticsearch.common.unit.TimeValue;
import org.elasticsearch.common.xcontent.XContentType;
import org.elasticsearch.index.query.QueryBuilders;
import org.elasticsearch.index.query.TermQueryBuilder;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.builder.SearchSourceBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightBuilder;
import org.elasticsearch.search.fetch.subphase.highlight.HighlightField;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
import java.util.Map;
import java.util.concurrent.TimeUnit;

@Service
public class ContentService {

    @Autowired
    private RestHighLevelClient restHighLevelClient;

    //1解析数据库放入es索引中
    public Boolean parseContent(String keywords) throws Exception {
        List<Content> contents = new HtmlParesUtil().parseJD(keywords);
        //把查询的数据放入es中
        BulkRequest bulkRequest = new BulkRequest();

        bulkRequest.timeout("2m");

        for (int i = 0;i<contents.size();i++) {
            bulkRequest.add(
                    new IndexRequest("jd_goods")
                            .source(JSON.toJSONString(contents.get(i)),XContentType.JSON));
        }
        BulkResponse bulk = restHighLevelClient.bulk(bulkRequest, RequestOptions.DEFAULT);
        return !bulk.hasFailures();
    }

    //2获取这些数据实现搜索功能

//    3高亮
      public List<Map<String,Object>> searchPageHighlightBuilder(String keyword,Integer pageNo,Integer pageSize) throws IOException {
    if(pageNo <= 1){
        pageNo = 1;
    }
//        条件搜索

    SearchRequest searchRequest = new SearchRequest("jd_goods");
    SearchSourceBuilder sourceBuilder = new SearchSourceBuilder();

//        分页
    sourceBuilder.from(pageNo);
    sourceBuilder.size(pageSize);

//        精准匹配
    TermQueryBuilder termQueryBuilder = QueryBuilders.termQuery("title", keyword);
    sourceBuilder.query(termQueryBuilder);
    sourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS));

//        高亮
     HighlightBuilder highlightBuilder = new HighlightBuilder();
          highlightBuilder.field("title");
          highlightBuilder.requireFieldMatch(true);
          highlightBuilder.preTags("<span style='color:blue'>");
          highlightBuilder.postTags("</span>");
          sourceBuilder.highlighter(highlightBuilder);


//       执行搜索
    searchRequest.source(sourceBuilder);
    SearchResponse searchResponse = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);

//        解析结果
    ArrayList<Map<String,Object>> list = new ArrayList<>();
    for (SearchHit documentFields:searchResponse.getHits().getHits()
    ) {
        Map<String, HighlightField> highlightFields = documentFields.getHighlightFields();
        HighlightField title = highlightFields.get("title");
        Map<String, Object> sourceAsMap = documentFields.getSourceAsMap();
        
        if (title != null){
            Text[] fragments = title.fragments();
            String n_title = "";
            for (Text text: fragments
                 ) {
                n_title += text;
            }
            sourceAsMap.put("title",n_title);
        }

        list.add(sourceAsMap);
    }
    return  list;
}

}
